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Search: id:A075127
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| A075127 |
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Safe perfect powers: perfect powers n such that (n-1)/2 is also a perfect power. |
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+0
1
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OFFSET
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1,1
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MATHEMATICA
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pp = Select[ Range[10^8], Apply[ GCD, Last[ Transpose[ FactorInteger[ # ]]]] > 1 & ]; Select[pp, Apply[GCD, Last[ Transpose[ FactorInteger[( # - 1)/2]]]] > 1 & ]
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CROSSREFS
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Cf. A001597, A070428, A075114.
Sequence in context: A153223 A157569 A085799 this_sequence A013733 A112028 A161159
Adjacent sequences: A075124 A075125 A075126 this_sequence A075128 A075129 A075130
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KEYWORD
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easy,nonn
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), Oct 11 2002
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EXTENSIONS
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One more term from Robert G. Wilson v (rgwv(AT)rgwv.com), Oct 16 2002
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